PPRuNe Forums - B737 Stab Trim Switch(es)

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oscarzulu737

23rd January 2011 16:50

B737 Stab Trim Switch(es)

Can someone explain off of a reference why the trim switch on the control wheel is actually two switches side by side?

BOAC	23rd January 2011 17:15

Double pole switch

STBYRUD

23rd January 2011 17:19

They prevent a runaway caused by one shorted or stuck switch. this way there are two breaker points in the circuit. (plus the cutout switches...)

blousky

23rd January 2011 22:40

And you can even operate the trim with both switches in different directions!
Now try it and see which one give the direction input and which one just make contact.

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